package collection;

import java.util.*;

public class CollectionsDemo {
    public static void main(String[] args) {

        List<Integer> list=new ArrayList<>();
        Random rand=new Random();
        for(int i=0;i<10;i++){
            list.add(rand.nextInt(100));
        }
        System.out.println("list:"+list);

        Collections.sort(list);//升序排列
        System.out.println("list:"+list);

        Collections.reverse(list);//反转list，数据已经改变了
        System.out.println("list:"+list);

    }
}
